import React,  { Component } from 'react';
import { Chart, Geom, Axis, Tooltip, Coord, Label, Legend, View, Guide, Shape } from 'bizcharts';
import DataSet from '@antv/data-set';


const data = [
{ month: 'Jan', Tokyo: 7.0, London: 3.9 },
{ month: 'Feb', Tokyo: 6.9, London: 4.2 },
{ month: 'Mar', Tokyo: 9.5, London: 5.7 },
{ month: 'Apr', Tokyo: 14.5, London: 8.5 },
{ month: 'May', Tokyo: 18.4, London: 11.9 },
{ month: 'Jun', Tokyo: 21.5, London: 15.2 },
{ month: 'Jul', Tokyo: 25.2, London: 17.0 },
{ month: 'Aug', Tokyo: 26.5, London: 16.6 },
{ month: 'Sep', Tokyo: 23.3, London: 14.2 },
{ month: 'Oct', Tokyo: 18.3, London: 10.3 },
{ month: 'Nov', Tokyo: 13.9, London: 6.6 },
{ month: 'Dec', Tokyo: 9.6, London: 4.8 }
];
const ds = new DataSet();
const dv = ds.createView().source(data);
dv.transform({
  type: 'fold',
  fields: [ 'Tokyo', 'London' ], // 展开字段集
  key: 'city', // key字段
  value: 'temperature', // value字段
});
const cols = {
  month: {
    range: [ 0, 1 ]
  }
}

export default class Series extends Component {
  render() {
    return (
      <Chart height={400} data={dv} scale={cols} forceFit>
        <Axis name="month" />
        <Axis name="temperature" label={{formatter: val => `${val}°C`}}/>
        <Tooltip crosshairs={{type : "y"}}/>
        <Geom type="line" position="month*temperature" size={2} color={'city'} />
        <Geom type='point' position="month*temperature" size={4} shape={'circle'} color={'city'} style={{ stroke: '#fff', lineWidth: 1}} />
      </Chart>
    );
  }
}
